function oUA() {
    /* TO DO: Lynx, WebTV. FIX ME: Gecko. */
    var UA = navigator.userAgent;
    if (UA.indexOf("Mac") != -1)                    { this.Mac     = true; }
    var i = UA.indexOf("MSIE");
    if (i != -1) {                                    this.IE      = true;
        var v = UA.charAt(i + 5);
        if (v == "2")                               { this.IE2     = true; }
        if (v == "3")                               { this.IE3     = true; }
        if (v == "4")                               { this.IE4     = true;
            if (UA.substring(i + 6, i + 8) == ".5") { this.IE45    = true; } }
        if (v == "5")                               { this.IE5     = true;
            if (UA.substring(i + 6, i + 8) == ".5") { this.IE55    = true; } }
        if (v == "6")                               { this.IE6     = true; }
    } else if (UA.indexOf("Mozilla") != -1) {
        if (UA.indexOf("Opera") != -1)              { this.Opera   = true; } 
        else if (UA.indexOf("Netscape6") != -1)     { this.N6      = true; }
        else if (UA.indexOf("Netscape7") != -1)     { this.N7      = true; }
        else if (UA.indexOf("Gecko") != -1)         { this.N6      = true; }
        else                                        { this.NN      = true; }
    } else {
                                                      this.Unknown = true;
    }
}